<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>特殊样式</title>
    <style>
        a {
            /* 清除高亮 */
            -webkit-tap-highlight-color: transparent;
        }
        button {
            /* 去掉默认外观样式 */
            -webkit-appearance: none;
        }
        /* 禁用长按页面时的弹出菜单 */
        /* img,a { -webkit-touch-callout: none;} */
    </style>
</head>
<body>
    <a href="#">哒哒</a>
    <button>按钮</button>
</body>
</html>